If anyone happens to have a copy of the Yamaha AX-700U service manual I'd be obliged to receive it from them.

Thanks,
John

teflon1

4th August 2009 02:00 PM

Wow, no one has a copy of the service manual for the ax-700U?

It would be a big help, mine is acting kind of funny, could be blown.

teflon1

4th August 2009 07:30 PM

Is it not worth trying to fix?

RocketScientist

4th August 2009 07:36 PM

Did you try searching on Google? Many places sell PDF service manuals for Yamaha products. The odds of someone here having it are probably not very good.

Netlist

4th August 2009 07:41 PM

John, it's probably worth fixing but I can't help with a manual.
Perhaps explaining what the fault is might trigger others to help you out.
I remember some Yamaha series having problems with the motorized volume control and/or input selector but I think this model isn't equipped with them.

/Hugo

Bigred

5th August 2009 03:57 AM

Well if it would be a big help then whats $10 or so to just buy one.

teflon1

5th August 2009 11:42 AM

Almost the same were you to buy it and ship it over, less shipping and that its your ten bucks that is.

The specs on these amps are respectable. I'm uncertain as to the topology within however it seems ordinary with a few hindering features. In its stock form it's found littered with nice audio grade electrolytic caps.

There seems to be some hum on it with a lack of amplification. DC offset checks out alright but I suspect a slight problem in the input or tone control/balance stage, many of which seem to have lost function.

It could be an issue with any one of the controls or pots but I suspect its at a more fundamental level than that to render most of those controls inoperable.

Netlist

5th August 2009 12:05 PM

You did check the 'tone bypass' and 'cd direct' buttons I assume?
Also, is the hum present without anything connected on the inputs, moderate volume and top cover in place?